void V8LazyEventListener::prepareListenerObject(ExecutionContext* executionContext)
{
if (!executionContext)
return;

// A ScriptState used by the event listener needs to be calculated based on
// the ExecutionContext that fired the the event listener and the world
// that installed the event listener.
v8::HandleScope handleScope(toIsolate(executionContext));
v8::Local<v8::Context> v8Context = toV8Context(executionContext, world());
if (v8Context.IsEmpty())
return;
ScriptState* scriptState = ScriptState::from(v8Context);
if (!scriptState->contextIsValid())
return;

    if (executionContext->isDocument() && !toDocument(executionContext)->allowInlineEventHandlers(m_node, this, m_sourceURL, m_position.m_line)) {
clearListenerObject();
return;
}

if (hasExistingListenerObject())
return;

    ASSERT(executionContext->isDocument());
ScriptState::Scope scope(scriptState);
String listenerSource =  InspectorInstrumentation::preprocessEventListener(toDocument(executionContext)->frame(), m_code, m_sourceURL, m_functionName);

// FIXME: Remove the following 'with' hack.
//
// Nodes other than the document object, when executing inline event
// handlers push document, form owner, and the target node on the scope chain.
// We do this by using 'with' statement.
// See chrome/fast/forms/form-action.html
//     chrome/fast/forms/selected-index-value.html
//     base/fast/overflow/onscroll-layer-self-destruct.html
//
// Don't use new lines so that lines in the modified handler
// have the same numbers as in the original code.
// FIXME: V8 does not allow us to programmatically create object environments so
//        we have to do this hack! What if m_code escapes to run arbitrary script?
//
// Call with 4 arguments instead of 3, pass additional null as the last parameter.
// By calling the function with 4 arguments, we create a setter on arguments object
// which would shadow property "3" on the prototype.
String code = "(function() {"
"with (this[2]) {"
"with (this[1]) {"
"with (this[0]) {"
"return function(" + m_eventParameterName + ") {" +
listenerSource + "\n" // Insert '\n' otherwise //-style comments could break the handler.
"};"
"}}}})";

v8::Handle<v8::String> codeExternalString = v8String(isolate(), code);

v8::Local<v8::Value> result = V8ScriptRunner::compileAndRunInternalScript(codeExternalString, isolate(), m_sourceURL, m_position);
if (result.IsEmpty())
return;

// Call the outer function to get the inner function.
    ASSERT(result->IsFunction());
v8::Local<v8::Function> intermediateFunction = result.As<v8::Function>();

HTMLFormElement* formElement = 0;
if (m_node && m_node->isHTMLElement())
formElement = toHTMLElement(m_node)->formOwner();

v8::Handle<v8::Object> nodeWrapper = toObjectWrapper<Node>(m_node, scriptState);
v8::Handle<v8::Object> formWrapper = toObjectWrapper<HTMLFormElement>(formElement, scriptState);
v8::Handle<v8::Object> documentWrapper = toObjectWrapper<Document>(m_node ? m_node->ownerDocument() : 0, scriptState);

v8::Local<v8::Object> thisObject = v8::Object::New(isolate());
if (thisObject.IsEmpty())
return;
if (!thisObject->ForceSet(v8::Integer::New(isolate(), 0), nodeWrapper))
return;
if (!thisObject->ForceSet(v8::Integer::New(isolate(), 1), formWrapper))
return;
if (!thisObject->ForceSet(v8::Integer::New(isolate(), 2), documentWrapper))
return;

// FIXME: Remove this code when we stop doing the 'with' hack above.
v8::Local<v8::Value> innerValue = V8ScriptRunner::callInternalFunction(intermediateFunction, thisObject, 0, 0, isolate());
if (innerValue.IsEmpty() || !innerValue->IsFunction())
return;

v8::Local<v8::Function> wrappedFunction = innerValue.As<v8::Function>();

// Change the toString function on the wrapper function to avoid it
// returning the source for the actual wrapper function. Instead it
// returns source for a clean wrapper function with the event
// argument wrapping the event source code. The reason for this is
// that some web sites use toString on event functions and eval the
// source returned (sometimes a RegExp is applied as well) for some
// other use. That fails miserably if the actual wrapper source is
// returned.
v8::Local<v8::Function> toStringFunction = v8::Function::New(isolate(), V8LazyEventListenerToString);
ASSERT(!toStringFunction.IsEmpty());
String toStringString = "function " + m_functionName + "(" + m_eventParameterName + ") {\n  " + m_code + "\n}";
V8HiddenValue::setHiddenValue(isolate(), wrappedFunction, V8HiddenValue::toStringString(isolate()), v8String(isolate(), toStringString));
wrappedFunction->Set(v8AtomicString(isolate(), "toString"), toStringFunction);
wrappedFunction->SetName(v8String(isolate(), m_functionName));

// FIXME: Remove the following comment-outs.
// See https://bugs.webkit.org/show_bug.cgi?id=85152 for more details.
//
// For the time being, we comment out the following code since the
// second parsing can happen.
// // Since we only parse once, there's no need to keep data used for parsing around anymore.
// m_functionName = String();
// m_code = String();
// m_eventParameterName = String();
// m_sourceURL = String();

setListenerObject(wrappedFunction);
}
